Alert archive / Maryland / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Maryland, 2008
299 severe thunderstorm warnings in 2008. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in 2008. Tap one for its archive.
- Severe Thunderstorm Warnings
- 299
- Busiest month
- June116 severe thunderstorm warnings
- Busiest day
- June 4, 200820 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
172 of 299 severe thunderstorm warnings covering Maryland in 2008 had a qualifying storm report inside them; 249 of 328 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.
Maryland, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 299 | 172 | 42% | 328 | 76% | 23 min |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 273 | 120 | 56% | 264 | 79% | 26 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 179 | 102 | 43% | 169 | 83% | 23 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 391 | 220 | 44% | 579 | 76% | 21 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 288 | 138 | 52% | 333 | 73% | 22 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 6, 4:26 PM EST | Severe Thunderstorm Warning | LWX | Washington | 20 min |
| Feb 6, 6:33 PM EST | Severe Thunderstorm Warning | PBZ | Garrett | 40 min |
| Feb 6, 7:04 PM EST | Severe Thunderstorm Warning | LWX | Allegany | 26 min |
| Feb 6, 9:17 PM EST | Severe Thunderstorm Warning | LWX | Washington | 43 min |
| Mar 4, 9:08 PM EST | Severe Thunderstorm Warning | PBZ | Garrett | 37 min |
| Mar 5, 12:29 AM EST | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 34 min |
| Mar 5, 12:43 AM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Carroll, Frederick, Howard, Montgomery, Prince George's | 47 min |
| Mar 5, 12:52 AM EST | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 38 min |
| Mar 5, 12:55 AM EST | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 50 min |
| Mar 5, 12:55 AM EST | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 50 min |
| Mar 5, 1:14 AM EST | Severe Thunderstorm Warning | AKQ | Somerset | 46 min |
| Mar 5, 1:35 AM EST | Severe Thunderstorm Warning | AKQ | Wicomico, Worcester | 40 min |
| Mar 5, 1:44 AM EST | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's | 61 min |
| Mar 8, 1:34 PM EST | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 41 min |
| Mar 8, 2:12 PM EST | Severe Thunderstorm Warning | LWX | Harford | 48 min |
| Mar 8, 2:38 PM EST | Severe Thunderstorm Warning | AKQ | Wicomico | 52 min |
| Mar 8, 3:22 PM EST | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 53 min |
| Mar 8, 3:36 PM EST | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 39 min |
| Mar 8, 3:54 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 51 min |
| Mar 8, 4:09 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 51 min |
| Mar 8, 4:20 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Harford, Howard, City of Baltimore | 55 min |
| Mar 8, 4:37 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 53 min |
| Apr 20, 2:17 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 44 min |
| Apr 20, 2:20 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 25 min |
| Apr 20, 3:07 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 38 min |
| Apr 20, 5:51 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, City of Baltimore | 54 min |
| Apr 20, 7:50 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore | 20 min |
| Apr 21, 12:46 AM EDT | Severe Thunderstorm Warning | LWX | Calvert | 24 min |
| Apr 28, 2:27 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 36 min |
| Apr 28, 2:49 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 30 min |
| Apr 28, 2:55 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 27 min |
| Apr 28, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 65 min |
| Apr 28, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 62 min |
| Apr 28, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's | 56 min |
| Apr 28, 4:51 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 39 min |
| May 9, 12:46 AM EDT | Severe Thunderstorm Warning | LWX | Charles | 44 min |
| May 9, 7:37 AM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 28 min |
| May 21, 5:21 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 28 min |
| May 31, 8:07 AM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 53 min |
| May 31, 10:14 AM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 44 min |
| May 31, 12:48 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 42 min |
| May 31, 1:12 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 48 min |
| May 31, 1:28 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 62 min |
| May 31, 1:36 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 54 min |
| May 31, 2:06 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Montgomery, Prince George's | 39 min |
| May 31, 2:28 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 47 min |
| May 31, 2:34 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 41 min |
| May 31, 2:39 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 81 min |
| May 31, 2:50 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 55 min |
| May 31, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 64 min |
| May 31, 3:21 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 54 min |
| May 31, 3:30 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 75 min |
| May 31, 3:59 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 39 min |
| May 31, 11:30 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 60 min |
| Jun 1, 4:44 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 23 min |
| Jun 1, 6:02 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 43 min |
| Jun 3, 7:30 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 43 min |
| Jun 4, 3:39 AM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 36 min |
| Jun 4, 2:16 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 59 min |
| Jun 4, 2:44 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 61 min |
| Jun 4, 2:45 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 60 min |
| Jun 4, 2:55 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 5 more | 80 min |
| Jun 4, 3:17 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 58 min |
| Jun 4, 3:24 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 81 min |
| Jun 4, 3:59 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 50 min |
| Jun 4, 4:14 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 61 min |
| Jun 4, 4:37 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico | 38 min |
| Jun 4, 5:20 PM EDT | Severe Thunderstorm Warning | AKQ | Worcester | 31 min |
| Jun 4, 6:07 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Montgomery, Prince George's | 53 min |
| Jun 4, 6:33 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 42 min |
| Jun 4, 6:41 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 64 min |
| Jun 4, 6:43 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 38 min |
| Jun 4, 7:16 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 50 min |
| Jun 4, 7:17 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 58 min |
| Jun 4, 7:23 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 67 min |
| Jun 4, 7:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Howard, Montgomery and 1 more | 39 min |
| Jun 4, 7:46 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 42 min |
| Jun 4, 8:01 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 44 min |
| Jun 4, 8:07 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 53 min |
| Jun 4, 8:13 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 46 min |
| Jun 4, 8:28 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 62 min |
| Jun 4, 8:38 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 22 min |
| Jun 4, 8:41 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 64 min |
| Jun 4, 8:41 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 19 min |
| Jun 4, 8:50 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 44 min |
| Jun 4, 9:20 PM EDT | Severe Thunderstorm Warning | AKQ | Wicomico, Worcester | 48 min |
| Jun 4, 9:36 PM EDT | Severe Thunderstorm Warning | AKQ | Worcester | 39 min |
| Jun 7, 6:58 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 47 min |
| Jun 7, 7:49 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 41 min |
| Jun 7, 8:21 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Prince George's | 39 min |
| Jun 7, 8:50 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 40 min |
| Jun 7, 8:59 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 46 min |
| Jun 7, 9:09 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 66 min |
| Jun 7, 9:44 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 32 min |
| Jun 7, 10:15 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 36 min |
| Jun 7, 10:29 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 61 min |
| Jun 7, 10:42 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 48 min |
| Jun 8, 12:32 AM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 43 min |
| Jun 10, 3:59 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 46 min |
| Jun 10, 4:15 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 60 min |
| Jun 10, 4:16 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 29 min |
| Jun 10, 4:52 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 37 min |
| Jun 10, 5:17 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 58 min |
| Jun 10, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, Howard, City of Baltimore | 55 min |
| Jun 10, 6:29 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 31 min |
| Jun 10, 6:37 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 21 min |
| Jun 10, 7:15 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick | 45 min |
| Jun 10, 8:04 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 30 min |
| Jun 10, 8:50 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Howard, City of Baltimore | 40 min |
| Jun 10, 9:05 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 40 min |
| Jun 14, 3:12 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 63 min |
| Jun 14, 5:51 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 48 min |
| Jun 14, 6:15 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 75 min |
| Jun 14, 6:18 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 57 min |
| Jun 16, 1:13 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 47 min |
| Jun 16, 3:14 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 31 min |
| Jun 16, 3:52 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 38 min |
| Jun 16, 4:12 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 43 min |
| Jun 16, 4:37 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 52 min |
| Jun 16, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 34 min |
| Jun 16, 4:59 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 61 min |
| Jun 16, 5:06 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 39 min |
| Jun 16, 6:05 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 55 min |
| Jun 16, 8:09 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 66 min |
| Jun 16, 9:24 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 21 min |
| Jun 16, 9:30 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 33 min |
| Jun 16, 10:46 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 32 min |
| Jun 16, 11:12 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 25 min |
| Jun 16, 11:33 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 13 min |
| Jun 19, 11:35 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 40 min |
| Jun 21, 8:42 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 48 min |
| Jun 21, 9:03 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 35 min |
| Jun 22, 4:55 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 50 min |
| Jun 22, 6:45 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 28 min |
| Jun 22, 7:07 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 53 min |
| Jun 22, 7:30 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert | 32 min |
| Jun 22, 8:20 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 46 min |
| Jun 22, 8:40 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 65 min |
| Jun 23, 4:38 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 23 min |
| Jun 23, 6:33 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 42 min |
| Jun 23, 6:43 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 62 min |
| Jun 23, 7:29 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 46 min |
| Jun 23, 7:32 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 58 min |
| Jun 23, 7:45 PM EDT | Severe Thunderstorm Warning | PHI | Caroline | 51 min |
| Jun 23, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 54 min |
| Jun 23, 8:30 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 45 min |
| Jun 23, 8:46 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 59 min |
| Jun 23, 9:09 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 66 min |
| Jun 23, 10:22 PM EDT | Severe Thunderstorm Warning | AKQ | Worcester | 32 min |
| Jun 27, 1:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 39 min |
| Jun 27, 2:54 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 40 min |
| Jun 27, 3:03 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 33 min |
| Jun 27, 3:13 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 62 min |
| Jun 27, 3:17 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 33 min |
| Jun 28, 7:12 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 63 min |
| Jun 28, 7:31 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 58 min |
| Jun 28, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 42 min |
| Jun 28, 8:48 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 62 min |
| Jun 28, 9:03 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 57 min |
| Jun 28, 9:35 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 70 min |
| Jun 28, 9:38 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 38 min |
| Jun 29, 4:15 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 45 min |
| Jun 29, 7:52 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 53 min |
| Jun 29, 10:24 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 51 min |
| Jun 29, 10:30 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Montgomery, Washington | 63 min |
| Jun 29, 10:45 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 75 min |
| Jun 29, 10:56 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 34 min |
| Jun 30, 5:18 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 57 min |
| Jun 30, 7:55 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 35 min |
| Jun 30, 10:13 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 36 min |
| Jun 30, 10:26 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 49 min |
| Jun 30, 11:04 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 39 min |
| Jul 4, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 51 min |
| Jul 4, 6:11 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 49 min |
| Jul 4, 6:39 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert | 51 min |
| Jul 4, 6:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 73 min |
| Jul 4, 6:48 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Saint Mary's | 42 min |
| Jul 4, 7:23 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 67 min |
| Jul 4, 8:19 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 41 min |
| Jul 4, 8:41 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 49 min |
| Jul 8, 4:21 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset | 54 min |
| Jul 20, 4:07 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 53 min |
| Jul 20, 4:41 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 64 min |
| Jul 20, 5:32 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 43 min |
| Jul 20, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 40 min |
| Jul 20, 5:48 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 27 min |
| Jul 20, 5:59 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 46 min |
| Jul 20, 6:05 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 40 min |
| Jul 20, 6:39 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 51 min |
| Jul 20, 6:57 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 37 min |
| Jul 20, 7:19 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 41 min |
| Jul 20, 7:53 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 28 min |
| Jul 20, 10:13 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 62 min |
| Jul 21, 9:35 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 55 min |
| Jul 21, 10:11 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 64 min |
| Jul 21, 10:23 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 67 min |
| Jul 21, 10:42 PM EDT | Severe Thunderstorm Warning | LWX | Allegany, Washington | 63 min |
| Jul 22, 10:30 AM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 45 min |
| Jul 22, 11:01 AM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 44 min |
| Jul 22, 11:22 AM EDT | Severe Thunderstorm Warning | PHI | Talbot | 36 min |
| Jul 22, 11:31 AM EDT | Severe Thunderstorm Warning | AKQ | Dorchester | 44 min |
| Jul 22, 11:14 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 30 min |
| Jul 23, 12:27 AM EDT | Severe Thunderstorm Warning | LWX | Harford | 48 min |
| Jul 23, 12:30 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 45 min |
| Jul 23, 1:11 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 64 min |
| Jul 23, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 46 min |
| Jul 23, 5:10 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 44 min |
| Jul 23, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 51 min |
| Jul 23, 6:11 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 64 min |
| Jul 23, 6:53 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 52 min |
| Jul 23, 7:14 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 61 min |
| Jul 23, 7:33 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 42 min |
| Jul 23, 7:52 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 38 min |
| Jul 23, 8:34 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 41 min |
| Jul 23, 8:38 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 52 min |
| Jul 23, 8:51 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 39 min |
| Jul 26, 5:40 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 50 min |
| Jul 26, 6:28 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery, Washington | 47 min |
| Jul 26, 7:12 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 48 min |
| Jul 26, 7:33 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 23 min |
| Jul 27, 12:24 PM EDT | Severe Thunderstorm Warning | LWX | Carroll | 35 min |
| Jul 27, 12:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard | 39 min |
| Jul 27, 1:23 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 52 min |
| Jul 27, 1:41 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 49 min |
| Jul 27, 1:46 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 44 min |
| Jul 27, 2:00 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 60 min |
| Jul 27, 2:03 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 42 min |
| Jul 27, 2:34 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's | 41 min |
| Jul 27, 2:35 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 55 min |
| Jul 27, 2:42 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Saint Mary's | 34 min |
| Jul 27, 2:56 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's | 64 min |
| Jul 27, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 43 min |
| Jul 27, 4:44 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 46 min |
| Jul 27, 4:46 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 44 min |
| Jul 27, 4:52 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 53 min |
| Jul 27, 5:27 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 32 min |
| Jul 30, 4:55 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 50 min |
| Jul 30, 5:08 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 28 min |
| Jul 30, 5:33 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 42 min |
| Jul 30, 5:47 PM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 43 min |
| Jul 30, 6:19 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 56 min |
| Jul 30, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 35 min |
| Aug 2, 1:07 AM EDT | Severe Thunderstorm Warning | PBZ | Garrett | 38 min |
| Aug 2, 3:09 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 41 min |
| Aug 2, 3:11 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 64 min |
| Aug 2, 4:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 39 min |
| Aug 2, 4:25 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 35 min |
| Aug 2, 4:32 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 58 min |
| Aug 2, 5:07 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 38 min |
| Aug 2, 5:42 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 31 min |
| Aug 2, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 28 min |
| Aug 2, 5:52 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 53 min |
| Aug 2, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 51 min |
| Aug 2, 6:46 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 40 min |
| Aug 2, 7:53 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Wicomico | 67 min |
| Aug 2, 9:44 PM EDT | Severe Thunderstorm Warning | LWX | Calvert | 29 min |
| Aug 7, 12:07 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 38 min |
| Aug 7, 1:12 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 33 min |
| Aug 7, 1:24 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 27 min |
| Aug 7, 1:49 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 37 min |
| Aug 7, 3:44 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 46 min |
| Aug 7, 4:27 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 48 min |
| Aug 7, 5:13 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Howard, Prince George's | 47 min |
| Aug 7, 9:52 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 38 min |
| Aug 10, 6:53 AM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Wicomico, Worcester | 52 min |
| Aug 10, 1:07 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 53 min |
| Aug 10, 2:56 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 30 min |
| Aug 10, 3:21 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 54 min |
| Aug 10, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 34 min |
| Aug 10, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 75 min |
| Aug 10, 5:54 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 35 min |
| Aug 10, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 61 min |
| Aug 10, 6:27 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 48 min |
| Aug 10, 6:36 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 69 min |
| Aug 10, 7:03 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 57 min |
| Aug 10, 7:46 PM EDT | Severe Thunderstorm Warning | AKQ | Somerset, Worcester | 59 min |
| Aug 14, 2:24 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 51 min |
| Aug 14, 2:32 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 43 min |
| Aug 14, 3:13 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 47 min |
| Aug 14, 3:18 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 16 min |
| Aug 14, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 50 min |
| Aug 14, 3:46 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 21 min |
| Aug 14, 4:00 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 34 min |
| Aug 14, 4:07 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 38 min |
| Aug 14, 4:30 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 45 min |
| Aug 14, 4:40 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford | 35 min |
| Aug 14, 4:58 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 47 min |
| Aug 14, 4:58 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 26 min |
| Aug 14, 5:17 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 43 min |
| Aug 14, 5:33 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 57 min |
| Aug 14, 6:24 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 51 min |
| Aug 14, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 49 min |
| Aug 14, 8:36 PM EDT | Severe Thunderstorm Warning | AKQ | Dorchester, Somerset, Wicomico | 39 min |
| Sep 9, 9:21 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 39 min |
| Sep 30, 8:04 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 41 min |
| Sep 30, 9:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert | 24 min |
| Sep 30, 10:39 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 66 min |
| Nov 15, 4:15 PM EST | Severe Thunderstorm Warning | PHI | Cecil, Kent | 30 min |
| Nov 15, 4:18 PM EST | Severe Thunderstorm Warning | PHI | Queen Anne's | 27 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Prince George's County60
- Anne Arundel County49
- Montgomery County47
- Frederick County37
- Washington County30
- Queen Anne's County29
- Calvert County27
- Saint Mary's County27
- Charles County27
- Baltimore County26
- Howard County25
- Talbot County25
- Caroline County23
- Somerset County22
- Wicomico County21
- Harford County21
- Kent County21
- Cecil County20
- Worcester County19
- Carroll County17
- Dorchester County17
- Garrett County15
- Allegany County13
- City of Baltimore13
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20072009
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.